What are forces?

What are forces?

Expected Progress: To recall different types of forces

Exceeding Expected Progress: To describe the difference between push and pull forces

What are forces?

• A force is a push or pull that causes a change in speed, direction or shape.

• Some forces are affected by speed, other forces are not.

• All forces come in pairs, no force exists by itself.

THRUST

This can be any driving force, it may be a push or pull, but it could be an engine which forces an object forward.

Lift

This is the force required to raise an object through a fluid

Air Resistance

This is a force which acts in the air, it can slow objects down when they are moving against it. Or if harnessed could be used to move an object along.

Friction

This force acts on objects when they are in contact with a surface, such as the ground. It can be reduced by ensuring both surfaces are smooth.

Gravity

This force affects every object on Earth. It is a force which pulls everything to the centre of the Earth.

Upthrust

This is an upward force which acts in water, it acts on an object against gravity and is why certain objects float.

Multiple Choice

Which force prevents you from floating up to the ceiling?

• gravity

• air resistance

Multiple Choice

Which force pushes a car forwards?

• air resistance

• thrust

Multiple Choice

Which force slows down a car?

• air resistance

• thrust

Multiple Choice

Which force slows down a parachute as it falls from a plane?

• gravity

• air resistance

Multiple Choice

Which force allows objects to float?

• Upthrust

• Gravity

Fill in the Blanks

Upthrust is an upward force which acts in water, it acts on an object against g

, and is why certain objects float.

Fill in the Blanks

Air r

is a force which acts in the air, it can slow objects down when they are moving against it. Or if harnessed could be used to move an object along.

Fill in the Blanks

L

is the force required to raise an object through a fluid